312 SURFACE GEOLOGY. 
Another style of disturbance is indicated in faults, some of which have 
been referred to upon page 39. Many of them can be regarded as the 
result of local sliding. One more difficult to explain may be seen be- 
tween Mink brook and the village of Hanover upon the West Lebanon 
road. The first bank next the brook, below Mr. Benton’s house, dips 10° 
northerly. Near the base of the principal hill, north of Benton’s, the 
dip is southerly at the same angle. Near the top the stratification is 
horizontal. The section along the road shows the loamy sand to have 
a synclinal structure, or, rather, there are two faulted segments dipping 
towards each other. Other highly inclined masses of alluvium occur 
close by the railroad depot in Norwich, at the north edge of the great 
plain two miles from Dartmouth college on the Lyme road, and near the 
mouth of Grant brook in Lyme, where the angle of inclination amounts 
to thirty degrees. It seems likely that the forces disturbing these ter- 
races were analogous to the elevating agencies that displayed their power 
in the earlier periods of geological time. Earthquakes of greater severity 
than are now common in the state might have been adequate to produce 
the results. The facts are given to draw the attention of other and future 
observers to the subject, as they may find more important illustrations of 
a continental force, or else discover satisfactory evidence that the dis- 
turbances have been entirely due to gravity. 
Ick AccCUMULATIONS. 
Occasionally the conditions are favorable for the continuation of ice 
unmelted through the entire summer. The best known example is in 
Tuckerman’s ravine, described in Volume I, page 623. Here it is ex- 
posed to the sun and air, continuing very long because of an immense 
accumulation. In other cases the ice is preserved in caverns, or in the 
midst of large fragments of rock, as in Lyman, Effingham, and Plymouth. 
In Lyman, about half a mile west of Parker hill, ice accummulates 
beneath large stone fragments at the base of a cliff. I found no ice there 
September 4, 1870, though the air issuing from the side was very cold, 
indicating its existence. The people in the neighborhood often obtain 
ice from this locality in the summer. In a journal published in Concord 
in 1823, it is related by Caleb Emery, of Lyman, that in 1816, a mem- 
orable cold summer, he saw a well frozen over solid, eight feet from the 
